How do you determine the length of a port and how much space the port takes up.
Im constructing a sub enclosure 33x13x19(LxWxH). The box will be built with .75" thick mdf board and I need the port to have a length of 34.25". 31.5x11.5x17.5=6339.375/1728=3.6686198c^3
The port is 5" wide.
5x11.5x34.25=1969.375/1728=1.13968461 c^3
Is the amount of space the port takes up actually 1.13968461 c^3 or have I done some miscalculation?

3.6686198-1.13968461=2.52893519c^3.

http://img.photobucket.com/albums/v431/oinkpyig/121212.jpg

I need to know how to determine port length and volume.

john denver

06-12-2008, 09:00 PM

port length is length from opening to mid way past turn and then to the end. The volume is the LxWxH

port length is 27.75 in your sketch

Oinkypig

06-12-2008, 09:30 PM

How can the RE Port calculator say that it is 34.25" of port length when it actually 28.5"
http://img.photobucket.com/albums/v431/oinkpyig/121212-1.jpg
http://img.photobucket.com/albums/v431/oinkpyig/12121212.jpg
Also to determine port length would it be determined like this?
http://img.photobucket.com/albums/v431/oinkpyig/fff.jpg